The earth’s crust The earth we live on is made up of land, water and air. The air forms a mantle round the earth, extending upwards to about 18 km. the portion of the earth that is not covered by water is our land. The height of the land us...

Forests-a source of life

Vast stretches of land naturally covered with a variety of plants are called forests. We need forests. Let us not be afraid of them. You know about Robin Hood and how he enjoyed his life in the forest. Millions of years ago, when there was no man,...

Birds keep their feathers clean and neat/

We see birds daily in our life. The crow, the sparrow, then hen and the eagle are common birds. It is interesting to watch birds and their habits. All birds have wings. They use their wings to fly. The wings are like a pair of arms. All birds have...

Bio-diesel: fuel of the future

Bio- fuel is popularly known as bio diesel In Andhra Pradesh the first bio- fuelled buses have hit the road. The bus corporations use 20% bio fuel obtained from the Kanuga plant and the reaming 80%the buses ply with in the two joint cities of...

That the lines of longitude were semi-circular joined at the North and South poles? We also said that all places on the same meridian had noon at the same time. There re altogether 180 pairs of meridians. As the earth turns round it makes a...

The story of a rain drop

One summer day, a raindrop fell from a cloud. Many other raindrops fell to the ground at the same time on the side of a hill. The raindrop joined the other raindrops and ran down the hill into a little brook. The raindrop travelled some distance...

Pollution from industries and slums

Leafy waste on our road There is campaign for the proper, hygienic disposal of waste in colony and city. Ensure that the municipal sweepers do not burn the fallen leaves of roadside trees. Bring pressure on them to bury the leaves in the...

History of radio worldwide

By the early 1930s, radio has acquired an industry status in many countries. Amplitude Modulated (AM) frequency was used for radio broadcasting prior to FM frequency. In 1937, Edwin Armstrong invented the frequency Modulated (FM) radio that used FM...

Adopt eco-friendly habits

Industries thrive on the consumption of natural resources like air, water, land and fossil fuels like petrol, diesel and gas. Industries also cause air, water and chemical pollution. Thus, industries have le us to development as well as to...

Changing in resource use In the beginning, the early man had only one need and that was to find food. But as time passed, his wants grew. He wanted clothes, houses and so on. He is still on a ceaseless quest to satisfy his needs. As pollution...

Saving fuel 1) Food must not be over –cooked, over or reheated. 2) Unclean vessels use up more energy. Clean a vessel thoroughly before use. Use pressure cookers. The width of the vessels should be larger than the size of the flame. 3) Cover the...

Mountain climbing

Parts of the land surface which stand at a much higher level than the areas surrounding it are called mountains. Most mountains are roughly cone- shaped. The highest mountains in the world belong to a range or group of mountains, famous for their...

In a rowboat to the Andaman Islands

There were other daring young men who set out on a dangerous voyage from Calcutta to a group of islands in the turbulent Bay of Bengal, known as the Andaman. Lt. George Albert Duke and is teammate Pinaki Ranjan Chatterjee were the two young...

How to Manage our Environment?

OUR EFFORTS IN MANAGEMENT OF ENVIRONMENT Here are some the traditions practised in India which indirectly has helped in the concept of Environment Management. It can be said that in the past, these traditions gave a good understanding of the...

Animals in danger

We can do nothing about animals which have become extinct but we can help prevent others from becoming extinct. The giant panda has been adopted by the world wildlife fund as symbol of the conditions of rare and endangered animals throughout the...

THERMODYNAMICS

Thermodynamics Thermodynamics is a branch of science which deals with exchange of heat energy between bodies and conversion of the heat energy into mechanical energy and vice-versa. Some definitions (a)Thermodynamics system (i) It is  a...

Use natural light as far as possible

We need fuels to run our machines. In the beginning, coal was burnt to produce energy. Later we turned to petrol, diesel and kerosene. In the modern world, electricity has been a major energy source. It is also considered the cleanest among the...

Just a few years ago, there used to be one electric supply line from any pole. But now, with multi-storied buildings mushrooming everywhere, there are multiple connections from the same electric pole. Instead of one transformer per street, there...

Electrical Energy and Kinetic energy

Electrical Energy and Kinetic energy: The Power can be defined as the ability to work in an electrical current. Like all energy, electrical energy is the property of an electrical system that allows the execution of work. It is achieved through...

The green revolution and its impact

India is an agricultural country and 70% of its revenue comes from agriculture and related industries. Cotton occupies only 5% of the cultivated land, but 70% of this crop depends on pesticides. A lion’s share of the synthetic chemical fertilizers...

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